That's partly due to a lack of truck drivers, as well as poor road conditions. As of late last month, a lot of aid delivered to Puerto Rico was still sitting at the ports.

And Rosselló told CNN he's ordering an investigation into reports that say aid is being mishandled. He said, "If there is a place, a locality that is not delivering food to the people of Puerto Rico that need it, there's going to be some hell to pay."

Correction: A previous version of this story incorrectly described the Jones Act.